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Reading mode2 DVDs fails

I am trying to use cdrdao to read and backup my (legitimate) Playstation2 DVDs in Linux. I have tried two different DVD drives (a 3 year old Samsung and a brand new LG GSA-4163B) without success. I have tried cdrdao 1.1.9 and 1.2.0. I have tried the generic-mmc and the generic-mmc-raw drivers. I have tried all the options in the cdrdao README (e.g. --driver generic-mmc:0x3). I have even looked at the source code. Here is where it fails:

A 'normal' DVD (e.g. the installation DVD that came with the drive) can be read fine (although it's mode 1). All of my PS2 disks fail (they are all mode 2 I think). I have included the output from one invocation below.

I did find that 'generic-mmc-raw:0x10000' gets rid of the first error ("ERROR: Cannot read disk toc.") but it still reverts to MODE 1 and then fails in the same way.

Is there anything else I can do to try and work out a fix? Perhaps what I am trying is no longer possible with cdrdao?